fixes for angular hello: String + and disable broken arg parsing

lib/runtime/dart/_interceptors.js

 var _interceptors;
 (function(exports) {
   'use strict';
   let JSArray = Array;
   let JSMutableArray$ = dart.generic(function(E) {
     class JSMutableArray extends JSArray$(E) {}
     JSMutableArray[dart.implements] = () => [JSMutableIndexable];
     return JSMutableArray;
   });
   let JSMutableArray = JSMutableArray$();
@@ skipping 60 matching lines @@
       } else if (this.isNaN) {
         if (b.isNaN) {
           return 0;
         }
         return 1;
       } else {
         return -1;
       }
     }
     get isNegative() {
-      return dart.equals(this, 0) ? 1['/'](this) < 0 : this['<'](0);
+      return dart.equals(this, 0) ? core.int['/'](1, this) < 0 : this['<'](0);
     }
     get isNaN() {
       return isNaN(this);
     }
     get isInfinite() {
       return this == Infinity || this == -Infinity;
     }
     get isFinite() {
       return isFinite(this);
     }
@@ skipping 115 matching lines @@
       let match = /^([\da-z]+)(?:\.([\da-z]+))?\(e\+(\d+)\)$/.exec(result);
       if (match == null) {
         throw new core.UnsupportedError(`Unexpected toString result: ${result}`);
       }
       let result = dart.dindex(match, 1);
       let exponent = +dart.dindex(match, 3);
       if (dart.dindex(match, 2) != null) {
         result = result + dart.dindex(match, 2);
         exponent = dart.notNull(exponent) - dart.dindex(match, 2).length;
       }
-      return core.String['+'](result, core.String['*']("0", exponent));
+      return dart.notNull(result) + core.String['*']("0", exponent);
     }
     toString() {
       if (dart.notNull(dart.equals(this, 0)) && 1 / this < 0) {
         return '-0.0';
       } else {
         return "" + this;
       }
     }
     get hashCode() {
       return this & 0x1FFFFFFF;
@@ skipping 152 matching lines @@
     get bitLength() {
       let nonneg = this['<'](0) ? dart.notNull(this['unary-']()) - 1 : this;
       if (dart.notNull(nonneg) >= 4294967296) {
         nonneg = (dart.notNull(nonneg) / 4294967296).truncate();
         return dart.notNull(JSInt[_bitCount](JSInt[_spread](nonneg))) + 32;
       }
       return JSInt[_bitCount](JSInt[_spread](nonneg));
     }
     static [_bitCount](i) {
       i = dart.as(dart.dsend(JSInt[_shru](i, 0), '-', dart.dsend(JSInt[_shru](i, 1), '&', 1431655765)), core.int);
-      i = (dart.notNull(i) & 858993459)['+'](dart.dsend(JSInt[_shru](i, 2), '&', 858993459));
-      i = 252645135 & i['+'](JSInt[_shru](i, 4));
+      i = core.int['+'](dart.notNull(i) & 858993459, dart.dsend(JSInt[_shru](i, 2), '&', 858993459));
+      i = 252645135 & core.int['+'](i, JSInt[_shru](i, 4));
       i = dart.notNull(i) + dart.notNull(dart.as(JSInt[_shru](i, 8), core.int));
       i = dart.notNull(i) + dart.notNull(dart.as(JSInt[_shru](i, 16), core.int));
       return dart.notNull(i) & 63;
     }
     static [_shru](value, shift) {
       return value >>> shift;
     }
     static [_shrs](value, shift) {
       return value >> shift;
     }
@@ skipping 331 matching lines @@
         s = s['+'](s);
       }
       return result;
     }
     padLeft(width, padding) {
       if (padding === void 0)
         padding = ' ';
       let delta = dart.notNull(width) - dart.notNull(this.length);
       if (dart.notNull(delta) <= 0)
         return this;
-      return core.String['+'](core.String['*'](padding, delta), this);
+      return core.String['*'](padding, delta) + dart.notNull(this);
     }
     padRight(width, padding) {
       if (padding === void 0)
         padding = ' ';
       let delta = dart.notNull(width) - dart.notNull(this.length);
       if (dart.notNull(delta) <= 0)
         return this;
       return this['+'](core.String['*'](padding, delta));
     }
     get codeUnits() {
@@ skipping 330 matching lines @@
   exports.findInterceptorForType = findInterceptorForType;
   exports.JSBool = JSBool;
   exports.JSNull = JSNull;
   exports.JSIndexable = JSIndexable;
   exports.JSMutableIndexable = JSMutableIndexable;
   exports.JSObject = JSObject;
   exports.JavaScriptObject = JavaScriptObject;
   exports.PlainJavaScriptObject = PlainJavaScriptObject;
   exports.UnknownJavaScriptObject = UnknownJavaScriptObject;
 })(_interceptors || (_interceptors = {}));